Liquid-xlevel



J. L. RUSSELL.

LIQUID LEVEL.

APPLICATION FILED AUG.9, 1911.

Patented Apr. 22, 1913.

29 II: I

W/TNESSES u INVENTOR L 1 r JazzZ/Qmfwl a g A TTOR/YEYS UNITED STATES N OFFICE JOHN LYTLE RUSSELL, F ALBION, CALIFORNIA.

LIQUID-LEVEL.

1,05 ,39 p H Specification of Letters Patent; P t t APR 22, 1913,

' Application filed August a, 1911. Serial in. 843,202.

To all whom it may concern: raved to convey any information indicat- Be it known that I, JOHN LYTLE RUSSELL ingthe angular disposition of the straight a citizen of the United States, and a'resident edge to the horizontal plane. s' of Albion, in the county of Mendocino and Mounted on the rod 11 to slide thereover, so State of California, have invented a new and having as shown in Fig. lot the draw and Improved Liquid-Level, of which the ings, gripping lip-like extensions 13, is an following is a full, clear, and exact descripindex 14. The index 14 is provided witha tion. mark 23 to indicate the median line of the Among the principal objects whichthe said'index. Adjacent and in parallel rela- '55 present invention hasin view are: to provide 'tionto'the median line are provided paral a finder for a level of the character delel lines 24"spaced apart to form sub-diviscr'ibed wherein is. employed an air bubble, sions of the smallest division of the said the finder providing veling surface for markings on the blade to thus operate as the said bubble semi circiihir-"in formgto a Vernier when adjusting the index 14 to poprovide a graduated scale disposed-i adjasition, This-adjustment of the index may cent the path of the spot of the finder and a be made with the naked eye or with an auxmovable index'for said scale to indicate the iliary magnifying glass. In its employment, position of the spot previously attained or to illustrate the operation, it may be said to be attained; and to provide means o-perathat it is desired to set the index toindicate tively connected with the finder for increas- 41? as being the desired angle for the dispo- I ing or diminishing the size or definition of sition of the straight edge. In this event the the spot. index would be moved until the main mark- One embodiment of the present invention ing indicated the 4 and then shifted until is disclosed in the structure illustrated in the the half of the one degree carried by the 0 accompanyin drawings, in which like charsmall markings on the index would regisacters of re erenee denote corresponding 7 ter with the. 4. This would insure the parts in all the views, and in which-- movement of the main line or finder of the Figure 1 is a side view of a level conindex standin at the 4P desired. If, on structed and arranged in accordance with the'other han the index be employed as a 35 the present invention; Fig. 2 is adetail view, registering device, the level having been set I on an enlarged scale, showing'in vertical to position, the index would be moved by section the-finder, the section being taken on hand until the pointer would register with the line 2-2 in Fi 3; Fig. 3 is. a cross secthe center of the spot on the finder. The tion'taken on the Tine 3-3 in Fig. 2; and readings could then be taken, the vernier i Fig. 4 is a cross section taken on the line markings carried by the extensions 13 being 4-4 in Fig. 2. used-to supplement the readings of the de' Asshown in the accompanying drawings, grees indicated on the blade 10. I the straight edge 9- is shown in the style new The finder in the present invention con-' ally employed in machine work. Mounted 'sists of a semi-circular hollow disk 15. The- I upon the straight edge at about the middle disk 15 may be molded as a complete hollow thereof is. a semi-circular scale blade 10. disk the peripheral ed e whereof is con. The b1ade10 is provided at its outer peri htracted substantially as s own in Fig. 3. In cry with a guide rod 11, one end whereo is the manufacture of the disk the same is ri idly seated in the body of the straight parted I on the median line forming two 109 5 e ge 9, as shown in'Fig. 2 of the drawings, semi-circular disks such as 15 shown in 'the. 2: 5

and the other end whereof is screw threaded drawings. To mount the 'disk 15 on the to engage threads formed on the interior, of straight edge 9 the latter is provided with a the hollow screw 12. The screw 12 is suit- 'pocket 16, the said pocket beings-shaped to ably threaded to engage a tapped perforareceive the cut edge of the disk. Opening 0 tion formed in the body of the straight edge through the straight edge into the pocket 9. The blade 10 is engraved substantial y 16 at about the center thereof is the screw as shown in Fig. 2 of the drawings to indithreaded plug 17 cate on one side thereof the degrees of the The plug 17, as shown in Fig.2 ofithe angles formed about the center around drawings, is screw threaded for engag'e- 1 which the said blade is curved. The side ment with the body ofthe straight edge 9. of the blade may, in fact, be optionally en- The plug 17 is tubular in form, the top 18 thereof having a central perforation to receive the threaded end of the screw 19. Ad-

, jacent the upper end ofthe plug 17 are two rifices 20, 20 through which the liquid contained in the disk 15 finds access to the in- .hard body. After the disk 15 is mounted,

and preliminarytomounting the screw 19 Y andzthe packing 21, the interior of the disk 15 is filled through the plug 17 with the liquid, water or s irits, in which the bubble is to be formed. hen the disk is properly filled the screw 19 and packing 21 are introduced in the interior channel of the plug 17. NVhen the exit from the plug 17 is properly closed the disk 15 is inverted, when the bubble contained therein will rise to the upper edge thereof. The screw 19, the head 22 whereof passes into the lug 17, is manipulated to raise the packing 21, and by thus displacing the liquidin the plug 17 forcing the same into the disk 15,an internal pressure is exerted upon the walls of the disk 15 and upon the bubble or spot of air, held in the liquid. This pressure reduces the bubble or spot, and at the. same time reinforces the'disk 15 -against pressure externally applied. It will be understood that if the bubble or s ot becomes vague or enlarged through lea age or loss of the liquid, this may be compensated for by setting up the screw 19 and packing 21 carried thereby. If the liquid becomes exhausted beyond the capacityto compensate for the same by the screw 19 and packing 21, it will be understood that the said screw and packing may be removed and the liquid In its operation a. level thus constructed and arranged operates in much the same manner as other so-called spirit levels. One

distinctive diflerence in the operation, however, is that in the present level the spot is caused to travel over "a curved or arced surface, or, stated in other words, the curved orarced surface is moved over the spot. In this manner the usual play of the spot above the same becomes fixedor eliminated, permitting the adjustment for which the level is employed .to be made more rapidly than bylevels having the ordinary straight edge finder. I

Having thus described my invention, what I claim as. new and desire to secure by Letters Patent is y A level employing a moving air spot having a circular transparent disk-like liquid container, the curved edge whereof forms a guide for the said spot; a curved index blade surrounding said container and juxtaposed to the edge thereof, said blade having marks to indicate the relative positions of the said spot; andmeans to vary the juxtaposition of said blade and container by moving the said blade to and from said container.

In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

, JOHN, LYTLE RUSSELL.

. Witnesses: F. H; Manse,

GERARD M. ALEXANDER. 

